Look Here & Here Seems you can build your own 3D printer.

that doesn't look right... and what a mission.

Ouch

Can't see myself attempting that anytime soon

But how does it work - doesn't seem to make any sense

Don't really know. It looks like it uses a syringe to build a 3d project one layer at a time.
You can design and build your own Lego bloks.

What joy! Insteading of spending BD 1 for a BD 1 lego block set

I can spend BD 2,000.... to make BD 1 Lego blocks

Now that is amazing savings all the way!

I understand there are simaler devices in industrie but that this model are cheaper & more fleksable.